LS7 Aluminum Intake
03-25-2014, 10:23 PM
#1
Staging Lane
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LS7 Aluminum Intake I was planning to use a Mast 4500 intake on an LS7 and have a strong 3000-7000 powerband for a road course car. I was told by Mast that that they sell these primarily to drag racers and I may lose a lot of torque down low. I also heard from a head porter that I need to turn 7800 to make use of that intake. What is confusing to me is that the few dyno test I found have it giving up very little down low to both a factory intake and a custom sheetmetal intake. Anyone here with real world experience, please enlighten me. Also, what does the GMPP 4150 intake flow?
03-26-2014, 11:35 AM
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Staging Lane
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I am updating this thread with a graph of a dyno test by Mast of a 440" engine using the 4500 intake. Looks strong enough down low.
I also found a comparison of the FAST intake vs Mast on a 468". Again the Mast does not give up much below torque peak. Any reason not to use it on a 427" road race engine?
I also found a comparison of the FAST intake vs Mast on a 468". Again the Mast does not give up much below torque peak. Any reason not to use it on a 427" road race engine?
Last edited by Bill71; 03-26-2014 at 12:05 PM.
04-02-2014, 12:50 PM
#4
I would be curious if you could do your own actual testing of a ported LS7 intake vs. the MAST what the results are.
Run as much compression as your fuel supports. I have a ported LS7 intake (427ci) with only 11.25:1 compression that runs on 91 octane. When I dump in an e85/91 blend and turn up the timing.... especially mid range.... the engine feels like it really comes alive.
A straight intake pipe going into the TB vs. one with bends adds 15-20rwhp due to less turbulence. Make sure you design your setup with this in mind.
If you want more low/midrange dump the LS7 heads and put on some TFS or AFR heads.
Run as much compression as your fuel supports. I have a ported LS7 intake (427ci) with only 11.25:1 compression that runs on 91 octane. When I dump in an e85/91 blend and turn up the timing.... especially mid range.... the engine feels like it really comes alive.
A straight intake pipe going into the TB vs. one with bends adds 15-20rwhp due to less turbulence. Make sure you design your setup with this in mind.
If you want more low/midrange dump the LS7 heads and put on some TFS or AFR heads.
04-02-2014, 01:53 PM
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04-06-2014, 12:44 PM
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Here's my comparison of the Mast LSX LS7 intake (690 RWHP) versus my Beck sheetmetal (680 RWHP)....as you can see, peak torque actually moved up ~400RPM to ~ 6300 RPM (of course this is with a solid roller can but small 258* intake duration)! Hope this helps 
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04-08-2014, 05:02 PM
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04-11-2014, 05:25 PM
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I don't recall exact numbers, so please don't throw rocks at me, lol
Speaking with my builder on a 447/single plane intake. He reccomended a 4150 vs a 4500. The 4150 flowed around 1000cfm and the 4500 1350. The inference was that the 4500 might be a bit lazy, but really it's a matter of the total combo. It appears you're getting great results.
Speaking with my builder on a 447/single plane intake. He reccomended a 4150 vs a 4500. The 4150 flowed around 1000cfm and the 4500 1350. The inference was that the 4500 might be a bit lazy, but really it's a matter of the total combo. It appears you're getting great results.
05-11-2014, 07:45 PM
#15
I don't recall exact numbers, so please don't throw rocks at me, lol
Speaking with my builder on a 447/single plane intake. He reccomended a 4150 vs a 4500. The 4150 flowed around 1000cfm and the 4500 1350. The inference was that the 4500 might be a bit lazy, but really it's a matter of the total combo. It appears you're getting great results.
Speaking with my builder on a 447/single plane intake. He reccomended a 4150 vs a 4500. The 4150 flowed around 1000cfm and the 4500 1350. The inference was that the 4500 might be a bit lazy, but really it's a matter of the total combo. It appears you're getting great results.
